Professor Margaret Tarkington, who is visiting at the University of Cincinnati College of Law this year, has posted two of her newest articles to SSRN. The first, Government Speech and the Publicly Employed Attorney, is forthcoming in the Brigham Young University Law Review. The second, A First Amendment Theory for Protecting Attorney Speech, is a working paper. Professor Tarkington has written on the topic of attorney speech before. You can see here other articles on her SSRN author page.